TOOL CLAMPING DEVICE CAPABLE OF BEING TURNED AND DRIVEN

PURPOSE: To always use the cylindrical tool surface by providing a concentric ring groove to fasten a tool shell having the substantially same diameter by both fastening disks. CONSTITUTION: At least two fastening disks 1, 2 and a common fastening screw 3 are provided to fasten a tool shell 4 between the two disks 1, 2. At this time, the rotary axis 5 extends by passing through the disks 1, 2 or the screw 3. Both disks 1, 2 have a concentric ring groove 6 to fasten the tool shell 4 having the substantially same diameter. While the disk 1 has an axial directional bridging piece 7 to grip the tool shell 4 from outside, the disk 2 has a bridging piece end part inserting cutout 8 of the axial directional bridging piece 7 by correspondingly dispersing, for example, by dispersion of 120 deg.. The bridging piece 7 partitions the outer peripheral surface of the belonging ring groove 6. A stabilizing bush 16 having the substantially same width can be inserted into the tool shell 4, and is advantageous when using the tool shell 4 composed of an easily bendable material.